Gracefully stop Postfix

Postfix mail transfer agent (MTA) control program.
See also `dovecot`, a mail delivery agent (MDA) that integrates with Postfix.
More information: <http://www.postfix.org>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

sudo postfix stop

click the source code to copy install postfix on any operating system with command-not-found.com